Conserving Resources at Home

Lifestyle · 10 questions

Ten questions on household energy and water use, product life cycles, and waste prevention.

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1. When comparing bulbs with equal light output, which rating measures that output rather than electrical power?

   1. Kelvins
   2. Volts
   3. Lumens
   4. Hertz
   Show the answer

   C) Lumens

2. A tap leaks 2 mL of water per second. How many litres does it lose over 24 uninterrupted hours?

   1. 17.28 L
   2. 172.8 L
   3. 86.4 L
   4. 288 L
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   B) 172.8 L

3. Which gas do decomposing microorganisms need for respiration in an aerated garden compost heap?

   1. Nitrogen
   2. Methane
   3. Carbon dioxide
   4. Oxygen
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   D) Oxygen

4. By what main mechanism does a low-emissivity (low-e) window coating reduce heat loss?

   1. Reduced thermal conductivity of glass
   2. Reflection of infrared radiation
   3. Reduced convection between glass panes
   4. Reduced transmission of visible light
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   B) Reflection of infrared radiation

5. A shower head changes from 8 L/min to 6 L/min. How many litres are saved during a six-minute shower?

   1. 12 L
   2. 2 L
   3. 36 L
   4. 48 L
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   A) 12 L

6. What supplies the heat released to the room by a refrigerator’s condenser coils?

   1. Only heat taken from the interior
   2. Only compressor work
   3. Heat from the interior minus compressor work
   4. Heat from the interior plus compressor work
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   D) Heat from the interior plus compressor work

7. A disposable cup has 1.2 impact units; a reusable cup costs 40 to make and 0.2 to wash after each use. At how many uses do totals match?

   1. 20 uses
   2. 33 uses
   3. 40 uses
   4. 50 uses
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   C) 40 uses

8. As of 2026, the kWh value on an EU dishwasher energy label represents the total consumption of how many eco cycles?

   1. 1 cycle
   2. 100 cycles
   3. 10 cycles
   4. 365 cycles
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   B) 100 cycles

9. To calculate a heat pump’s heating COP, its delivered heat energy is divided by which quantity?

   1. Heat energy taken from outdoor air
   2. Total heat energy of indoor air
   3. Electrical energy consumed
   4. Total heat energy of outdoor air
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   C) Electrical energy consumed

10. What does a number inside a triangle on plastic packaging identify, without guaranteeing local recycling acceptance?

    1. Resin type
    2. Number of recycling cycles
    3. Percentage of recycled content
    4. Packaging service life
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    A) Resin type